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首页> 外文期刊>Applied optics >Performance of asynchronous fiber-optic code division multiple access system based on three-dimensional wavelength/time/space codes and its link analysis
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Performance of asynchronous fiber-optic code division multiple access system based on three-dimensional wavelength/time/space codes and its link analysis

机译：基于三维波长/时间/空间码的异步光纤码分多址系统的性能及其链路分析

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摘要

A novel family of three-dimensional (3-D) wavelength/time/space codes for asynchronous optical code-division-multiple-access (CDMA) systems with "zero" off-peak autocorrelation and "unity" cross correlation is reported. Antipodal signaling and differential detection is employed in the system. A maximum of [(W X T + 1) X W] codes are generated for unity cross correlation, where W and T are the number of wavelengths and time chips used in the code and are prime. The conditions for violation of the cross-correlation constraint are discussed. The expressions for number of generated codes are determined for various code dimensions. It is found that the maximum number of codes are generated for S <= min(W, T), where W and T are prime and S is the number of space channels. The performance of these codes is compared to the earlier reported two-dimensional (2-D)/3-D codes for asynchronous systems. The codes have a code-set-size to code-size ratio greater than W/S. For instance, with a code size of 2065 (59 X 7 X 5), a total of 12,213 users can be supported, and 130 simultaneous users at a bit-error rate (BER) of 10~(-9). An arrayed-waveguide-grating-based reconfigurable encoder/decoder design for 2-D implementation for the 3-D codes is presented so that the need for multiple star couplers and fiber ribbons is eliminated. The hardware requirements of the coders used for various modulation/detection schemes are given. The effect of insertion loss in the coders is shown to be significantly reduced with loss compensation by using an amplifier after encoding. An optical CDMA system for four users is simulated and the results presented show the improvement in performance with the use of loss compensation.
机译：报告了一种新颖的三维（3-D）波长/时间/空间码系列，用于具有“零”非高峰自相关和“统一”互相关的异步光码分多址（CDMA）系统。该系统采用对立信号和差分检测。最多生成[（W X T + 1）X W]个代码以进行单位互相关，其中W和T是代码中使用的波长数和时间码片，并且是质数。讨论了违反互相关约束的条件。针对各种代码尺寸确定生成代码数量的表达式。可以发现，对于S <= min（W，T），将生成最大代码数，其中W和T是质数，S是空间信道数。将这些代码的性能与先前报道的用于异步系统的二维（2-D）/ 3-D代码进行了比较。这些代码的代码集大小与代码大小之比大于W / S。例如，使用2065（59 X 7 X 5）的代码大小，可以支持总共12,213个用户，并且可以以10〜（-9）的误码率（BER）支持130个同时用户。提出了一种用于3D代码的2D实现的基于阵列波导光栅的可重构编码器/解码器设计，从而消除了对多个星形耦合器和光纤带的需要。给出了用于各种调制/检测方案的编码器的硬件要求。通过在编码后使用放大器进行损耗补偿，可以显着降低编码器中插入损耗的影响。模拟了一个用于四个用户的光CDMA系统，给出的结果表明使用损耗补偿可以改善性能。

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    《Applied optics》 |2010年第8期|共9页
  • 作者

    Jaswinder Singh;

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